TPS65140-Q1 phase margin

Kei Sato73562

Expert 2310 points

Will it be necessary to confirm phase margin of Vo2, Vo3 and Vo4?

In the case of Yes.

Please tell me how I should measure phase margin of Vo2, Vo3 and Vo4.

When I cannot measure it, please tell me the reason.

over 10 years ago

0 Wen-Shin Wang over 10 years ago

TI__Genius 14070 points

Hello Sato-san,

The supporting apps engineer is in training for the next several days. I will ask him to take a look, and please be aware that response may be delayed due to this.

Thanks and Best Regards,

Wen-Shin Wang

0 Mahmoud Harmouch over 10 years ago in reply to Wen-Shin Wang

TI__Mastermind 25710 points

No there is no need to measure the phase margin for Vo2, Vo3 and Vo4. These rails are stable as long as the extrenal components are within accepted range. Only phase margin of the boost rail Vo1 is necessary to measure.

0 Kei Sato73562 over 10 years ago in reply to Mahmoud Harmouch

Expert 2310 points

3404.TPS65140 Phase Margin.ppt

Thank you for reply. Mahmoud-san

When I'd like to measure phase margin of Vo2, Vo3 and Vo4,

should I measure by attachde contents.

Additional question.

Are Vo2 and Vo3 PFM movement, or is it PWM movement? Which is it?

0 Mahmoud Harmouch over 10 years ago in reply to Kei Sato73562

TI__Mastermind 25710 points

Yes the phase margin can be measured using your setup. Both negative and positive charge pump V02 and V03 are PWM mode.

0 Kei Sato73562 over 10 years ago in reply to Mahmoud Harmouch

Expert 2310 points

Thank you so much. Mahmoud-san.

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TPS65140-Q1 phase margin